Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6f23c6570eb90b4…

MALICIOUS

PDF

71.3 KB Created: 2021-02-11 07:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 47087a98fb9897bc7ceef784c000c4d1 SHA-1: ca49987bf9faa02faee0e45c405c003e26f91a65 SHA-256: b6f23c6570eb90b46fd692c1805ae03dde6ad34df1e536c0c1ece5879bdc096c
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/wb?keyword=barbie%20animated%20movies%20in%20english%20free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370540/normal_5fc61fe30b94d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449603/normal_5fe8f3fde5a85.pdfIn PDF document text
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/8f0f2b3.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/ripomosaruv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4504641/normal_5ff87b79674d0.pdfIn PDF document text
    • https://cdn.sqhk.co/kibutonap/jdigDMF/kafitesiviniwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff3933b20bb8.pdfIn PDF document text
    • https://cdn.sqhk.co/niwonosorude/2ge5idu/youtube_subaru_outback.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/92347256747.pdfIn PDF document text
    • http://pogedezibak.rf.gd/salesforce_crm_interview_questions_and_answers.pdfIn PDF document text
    • http://sobogasitizi.epizy.com/make_piano_sheet_music_online.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/duvakeketepube.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/mozege.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/user_manual_template_doc.pdfIn PDF document text
    • http://lugavatakavupo.rf.gd/run_android_apps_on_mac_2018.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d951.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD951 5568 bytes
SHA-256: 28f7a3c7a86288a40cca62f4dfc3f65dd6c1f919140b1ebdb8953da515b28183
font_01_sfnt_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 10688 bytes
SHA-256: da6e320585486451c82265e60cfaea042606509a6754f6ba4401d016685dedde